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Shear zone in polarized light, same image, brighter whites and darker blacks.
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Also known as the Darton Fault (for Nelson Horatio Darton of the USGS, who pushed for its preservation "from the effects of weathering and the small boy") or the White House Fault (because it runs southeast to underneath the northeast corner of the White House grounds), this reverse fault offsets the nonconformity betw...
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Viewed from Frederick County (Opequon Creek is the dividing line), you can see strata of the Ordovician-aged Edinburg Formation limestones and shales. These anticlines and synclines formed during Alleghanian mountain-building in the late Paleozoic. Another set of folds is just upstream: gigapan.org/gigapans...
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A recumbent fold is exposed in the walls of an abandoned limestone quarry next to the Shenandoah River in Page County, Virginia.
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Looking at an anticline in the Ordovician-aged Edinburg Formation from Frederick County, Virginia, on the western shore of Opequon Creek, gazing across into Clarke County. Strata are Ordovician; deformation is Alleghanian (late Paleozoic). Another set of folds is just upstream: gigapan.org/gigapans/120300 ...
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Geologic map overlay is the 1974 Geologic Map of the Ashby Gap quadrangle, by T.M. Gathright, Jr. and P.G. Nystrom, Jr. You can buy a copy here: www.dmme.virginia.gov/commerce/ProductDetails.aspx?productID=2184
Or you can download a PDF of it here: www.dmme.virginia.gov/commercedocs/RI_36.pdf
The LIDAR...-
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- "Cub Sandstone" (Uppermost Martinsburg Formation), near Catherine Furnace, Virginia by Callan Bentley
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Outcrop on the road in to Catherine Furnace.
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This outcrop of the late Ordovician Martinsburg Formation is located on Route 644 in Shenandoah County, about 20 feet above the North Fork of the Shenandoah River. GigaPan Stitch seems to have had some issues putting it together, which is frustrating. Still, there's a lot to be seen. At this outcrop, bedding is o...
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Samples collected from fault gouge in Eastern Connecticut, Tatnic Hill Formation NR64AA Cut Parallel to Strike of Fault Plane, looking perpendicular to strike NR64AB Cut Parallel to dominant Striae (multiple sets), looking perpendicular to striae Thin sections of these surfaces will be made and imaged soon.
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